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Saxberget |
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Sweden |
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Zn Pb Cu Ag
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Super Porphyry Cu and Au
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The Saxberget complex zinc-lead-copper-silver sulphide deposit is located within the Bergslagen ore district of central Sweden, about 150 km NW of Stockholm.
It is hosted by a Palaeoproterozoic sequence of volcanics and sediments on the Baltic Shield, and is located on the western margin of the Bergslagen province. The geology of the ore deposit is dominated by an isolated east-west striking belt of volcanics cut by several generations of granitoids emplaced during the 1800 Ma Svecokarelian orogenic cycle.
The ore is hosted by a 1 to 20 m thick metasedimentary unit characterised by Ca-Mg-Fe-rich skarn minerals, grading locally into dolomitic limestone. Above and below are thicker (150-200 m) quartzite units containing quartz and mica with subordinate gedrite, almandine, cordierite and sillimanite. All of these altered rocks are enclosed in a suite of dominantly acid volcanics.
The ordebody has a slab like geometry, with a strike length of 400 m, down plunge dimensions of more than 1500 m and thickness of 1 to 20 m. Although the orebody is complex it can be divided into a brecciated zinc and lead rich style, mostly in altered Ca-Mg-Fe-rich sediments (skarn), and a subordinate copper rich zone in the quartzites, with a gradual transition between the two types.
The original orebody totalled around 10 Mt. The Zn:Pb ratio is highest in the massive ores and least in the copper rich quartzites.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1985.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Jeppsson O A M, Selkman S 1985 - Distribution and zoning of Silver and associated elements in the complex Sulfide deposit at Saxberget, central Sweden: in Econ. Geol. v80 pp 614-626
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Vivallo W, Rickard D 1990 - Genesis of an Early Proterozoic Zinc deposit in high-grade metamorphic terrane, Saxberget, central Sweden: in Econ. Geol. v85 pp 714-736
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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